thank you very much. >>> president obama defended his six-month nuclear deal with iran when he spoke at a d.c. forum. it requires iran to apparently cap nuclear activities in exchange for slightly relaxed sanctions. the president suggests his critics are being very unrealistic if they believe that iran would suddenly give up all nuclear capabilities forever. >> one can envision an ideal world in which iran said we'll destroy every element and facility and you name it, it's all gone. i can envision a world in which congress passed every one of my bills that i put forward. i mean, there are a lot of things that i can envision that would be wonderful. >> well, the forum's being held by the brookings institution which is a washington think tank. >>> well, defense secretary chuck hagel is visiting u.s. troops today. during a surprise trip to afghanistan. he also met with afghan officials to discuss a security agreement which would allow some of the nato-led troops to stay in the country past 2014. the pact still hasn't been signed by afghan president hamid karzai, but hagel said that his